/*
 * Copyright (c) 2025 Huawei Technologies Co., Ltd.
 * This program is free software, you can redistribute it and/or modify it under the terms and conditions of
 * CANN Open Software License Agreement Version 2.0 (the "License").
 * Please refer to the License for details. You may not use this file except in compliance with the License.
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
 * See LICENSE in the root of the software repository for the full text of the License.
 */

#include "mlir/Support/IndentedOstream.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/TableGen/TableGenBackend.h"

#include <string_view>

using namespace llvm;
using mlir::raw_indented_ostream;

namespace {

std::string snakeToCamel(StringRef str)
{
	SmallVector<StringRef> tokens;
	str.split(tokens, '_', -1, false);
	size_t size = 0;
	for (auto token : tokens) {
		size += token.size();
	}
	std::string result;
	result.reserve(size);
	result += std::string_view(tokens.front());
	for (auto *it = tokens.begin() + 1; it != tokens.end(); ++it) {
		result += it->take_front(1).upper();
		result += std::string_view(it->drop_front(1));
	}
	return result;
}

class GenAPITypes
{
  	const RecordKeeper &records;

public:
  	explicit GenAPITypes(const RecordKeeper &records) : records(records) {}

  	void run(raw_ostream &os);
};

void GenAPITypes::run(raw_ostream &os)
{
	raw_indented_ostream ios(os);
	auto typeDefs = records.getAllDerivedDefinitions("APIType");
	ios << "#ifdef GEN_EMITTER\n";
	for (const auto *def : typeDefs) {
		if (!def->getValueAsBit("genEmitter")) {
			continue;
		}
		ios << "if (auto concrete = dyn_cast<::mlir::ascendc::"
			<< def->getValueAsString("typeName") << "Type>(type)) {\n";
		ios.indent() << "os << \"" << def->getValueAsString("apiName") << "\";\n";
		ios << "return success();\n";
		ios.unindent() << "}\n";
	}
	ios << "#undef GEN_EMITTER\n#endif // GEN_EMITTER\n";
}

TableGen::Emitter::OptClass<GenAPITypes>
    registration("gen-api-types", "Generate C++ from API type declarations");

} // namespace
